Which class of circuit is not monitored for integrity?

Class E circuits are not monitored for integrity, which distinguishes them from other circuit classes. In fire alarm systems, integrity monitoring is a critical feature that ensures the functionality of the circuit. Class A circuits have a dual path of communication; if one path is interrupted, the other can still maintain the system's operations. Class B circuits can also function effectively since they are typically used in simpler configurations where monitoring is not as extensive. Class D, on the other hand, typically involves special circuit arrangements for specific applications and may include certain monitoring features.

However, Class E circuits do not incorporate the same level of integrity monitoring as Class A or Class B. This lack of monitoring means that if a fault occurs in a Class E circuit, it may not be immediately detectable, which can pose a risk in terms of system reliability. Understanding the monitoring capabilities and limitations of different circuit classes is essential in designing and implementing fire alarm systems, ensuring that the chosen circuit type meets the required safety standards and operational needs.